// bindingHandlers.text 定义在if.js
bindingExecutors.text = function(val, elem) {
	val = val == null ? "" : val //不在页面上显示undefined null
	if (elem.nodeType === 3) { //绑定在文本节点上
		try { //IE对游离于DOM树外的节点赋值会报错
			elem.data = val
		} catch (e) {}
	} else { //绑定在特性节点上
		elem.textContent = val
	}
}